JP5627005B2 - Bending roll device - Google Patents

Description

  The present invention relates to a bending roll apparatus for bending a fan-shaped plate-shaped workpiece into a desired conical surface by passing it between upper and lower rolls.

  A bending roll apparatus that passes a fan-shaped plate-shaped workpiece between upper and lower rolls and bends and forms it into a conical cylinder or a partial conical cylinder having a desired conical surface (for example, Patent Document 1). Reference) and those having upper and lower rolls tapered (for example, see Patent Document 2). These bending roll devices include a three-roll type in which two lower rolls are arranged with respect to one upper roll, and a four-roll type in which three lower rolls are arranged. There is.

  The bending roll apparatus described in Patent Document 1 includes a first movement restricting member that brakes an inner arc-shaped side of a plate-like workpiece that passes between cylindrical upper and lower rolls, and an outer arc-shaped side that has passed through a machining bend. And a second movement restricting member for restricting the moving direction of the inner arcuate side, and the passage speed on the inner arcuate side is made slower than the outer arcuate side and is bent into a conical cylinder having a desired conical surface. Yes.

  Moreover, the bending roll apparatus described in Patent Document 2 is provided with a positioning tool for positioning one width end of a plate-like workpiece that passes between tapered upper and lower rolls, and has a small diameter, large diameter, and Based on each dimension of the length, there is no speed difference between the plate-shaped workpiece and the peripheral speed of the upper and lower rolls in the width direction of the plate-shaped workpiece, that is, at a predetermined roll axial position where slip does not occur The workpiece is positioned.

JP 2000-33426 A Japanese Patent No. 3547640

  The bending roll apparatus described in Patent Document 1 causes a difference in speed between the plate-like work and the peripheral speed of the cylindrical upper and lower rolls in the width direction of the plate-like work, and the plate-like work slips. There is a problem that scratches are likely to occur on the front and back surfaces. In addition, the movement restricting member brakes the concave arcuate inner width end of the plate-like workpiece having a difference in the circumferential speed and speed of the roll, and the convex arc-like shape of the plate-like workpiece trying to escape in the width direction due to the speed difference. Since the outer width edge is forcibly restrained, the width edge portion of the plate-like workpiece is also easily damaged.

  Moreover, since the bending roll apparatus described in Patent Document 2 does not cause a slip between the plate-like workpiece and the tapered upper and lower rolls, there is no fear of causing a scratch on the front and back surfaces of the plate-like workpiece. If the plate-like workpiece is once deviated from a predetermined position in the roll axis direction due to tool play, slight distortion of the plate-like workpiece, etc., there is a problem that the deviation becomes large as it is, and the desired conical surface cannot be bent. That is, when positioning the concave arcuate inner width end with the positioning tool, if the plate-like workpiece is displaced to the outer width end side, the peripheral speed ratio of the taper roll at the outer width end and the inner width end becomes smaller, and the plate The workpiece moves in the straight direction side perpendicular to the roll axis direction that escapes from the positioning tool on the inner width end side. Also, when positioning the outer width end of the convex arcuate shape, if the plate-shaped workpiece is displaced toward the inner width end, the peripheral speed ratio of the taper roll at the outer width end and the inner width end is increased, and the plate-shaped workpiece is There is a fear that the inclination in the horizontal plane may increase so as to escape from the positioning tool on the outer width end side.

  Then, the subject of this invention is providing the bending roll apparatus which can bend and shape a plate-shaped workpiece to a desired conical surface, without producing a slip between an up-and-down roll.

In order to solve the above-mentioned problems, the present invention allows a fan-shaped plate-like workpiece to pass between tapered upper and lower rolls, and one width end of the plate-like workpiece to be passed between the rolls is positioned in a predetermined roll axial direction. In a bending roll apparatus for bending the plate-like workpiece into a desired conical surface, positioning means are provided on both the inlet side and the outlet side of the upper and lower rolls, and the positioning means A configuration is adopted in which pressing means is provided to face the other end of the plate-shaped workpiece so as to face each other in the roll axis direction and press the plate-shaped workpiece to the positioning means side with a constant force by a hydraulic actuator . .

  That is, a pressing unit that presses the other width end of the plate-shaped workpiece toward the positioning unit side with the positioning unit that positions one width end of the plate-shaped workpiece in the roll axis direction facing the positioning unit. By providing, the plate-like work which is going to deviate from the predetermined roll axis direction position for some reason is pushed back to the predetermined roll axis direction position by the pressing means, and the escape of the plate-like work from the positioning means is prevented. The shaped workpiece can be bent into a desired conical surface.

Positioning means for positioning one width end of the plate-like work is the predetermined roll that does not cause a speed difference between the passage speed of the plate-like work and the peripheral speed of the upper and lower rolls in the width direction of the plate-like work. By enabling movement to the axial position, slip between the plate-like workpiece and the upper and lower rolls can be prevented.

The position where no speed difference is generated between the passage speed of the plate-like workpiece and the peripheral speed of the upper and lower rolls in the width direction of the plate-like workpiece can be obtained as follows, for example. As shown in FIG. 4, consider the case of positioning the inner width end of a fan-shaped plate-like workpiece. Set the center O of the central angle of the fan-shaped workpiece on the center line of the tapered roll, the workpiece width is b, the small diameter of the product of the conical cylinder or partial cone cylinder to be bent is d ₁ , and the large diameter is d ₂ , the length of the roll is L, the small diameter is D ₁ , and the large diameter is D ₂ . Distance x from the small diameter end of the roll on the roll of the center line to the inner width end of the workpiece, respectively signals y _1, y ₂ the roll diameter at the inner width end and the outer width end of the workpiece in this case, y _1, y ₂ is obtained by the following equation.
_{y 1 = D 1 + (D} 2 -D 1) · x / L (1)
_{y 2 = D 1 + (D} 2 -D 1) · (x + b) / L (2)

The condition that the speed difference between the workpiece passing speed and the roll circumferential speed becomes zero in the workpiece width direction is the arc length ratio between the outer width end and the inner width end of the workpiece, and the outer width end and the inner width end. Since the roll circumference ratio is equal, the following equation is obtained.
d ₂ / d ₁ = y ₂ / y ₁ (3)
Substituting Equations (1) and (2) into Equation (3) gives the following equation.
d ₂ / d ₁ = {D ₁ + (D ₂ −D ₁ ) · (x + b) / L} / {D ₁ + (D ₂ −D ₁ ) · x / L
} (4)
When formula (4) is arranged, the distance x from the small-diameter end of the roll to the inner width end of the work is expressed by the following formula using each of known values b, d ₁ , d ₂ , L, D ₁ , D _2. Desired.
x = b · d ₁ / (d ₂ −d ₁ ) −L · D ₁ / (D ₂ −D ₁ ) (5)

  From the distance x obtained by the equation (5), it is possible to specify the installation position where the work slip does not occur. The positioning position Q of the inner width end of the work is an arbitrary arc inner width end of the specified work position. Can be set to position. Although description is omitted, the positioning position can be set by the same procedure when positioning the outer width end of the workpiece.

  The bending roll device according to the present invention is configured such that one width end of a plate-shaped workpiece is opposed to a positioning means for positioning the predetermined width axis position in a roll axis direction, and the other width end of the plate-shaped workpiece is positioned as positioning means. Since the pressing means for pressing to the side is provided, escape of the plate-like workpiece from the positioning means can be prevented, and the plate-like workpiece can be bent and formed into a desired conical surface.

Front view showing an embodiment of a bending roll apparatus Partially omitted plan view of FIG. (A), (b) is an arrow view along the IIIa-IIIa line and the IIIb-IIIb line of FIG. 2, respectively. Conceptual diagram explaining the method of positioning the inner width edge of a plate-like workpiece

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, this bending roll device is of a three-roll type including one tapered upper roll 1 and two pairs of lower rolls 2 having the same taper shape. The fan-shaped plate-like workpiece W is reciprocated between the upper roll 1 and the lower roll 2 to increase the curvature of the conical surface formed as the number of passes increases, and is bent into a conical cylinder product S.

  The upper roll 1 has a large-diameter side bearing box 3a pushed down from above by a cylinder 4a and a small-diameter side bearing box 3b pulled down from below by a cylinder 4b. Go up and down along. The raising / lowering position of the upper roll 1 is set to a lowered position that approaches the lower roll 2 as the number of passes increases. The small-diameter side frame can be turned over in order to extract the molded conical cylinder product S from between the upper and lower rolls 1 and 2.

  The pair of lower rolls 2 are arranged obliquely below both sides of the upper roll 1 with the large diameter side and the small diameter side in the same direction as the upper roll 1, and are respectively motorized (not shown) according to the forward path and the backward path. It is rotationally driven in forward and reverse directions. By the rotational drive of the lower roll 2, the work W is reciprocated with the concave arcuate inner width end directed toward the small diameter side of the upper and lower rolls 1 and 2.

  Positioning means 6 for positioning the concave arcuate inner width end of the workpiece W is provided on the small diameter side inlet side and outlet side of the upper and lower rolls 1 and 2. This positioning means 6 has a vertical roller 6d attached to a nut 6c screwed to a screw shaft 6b rotated by a servo motor 6a, and a screw shaft 6b oriented parallel to the axis of the upper roll 1. The roll of the work W passing between the upper and lower rolls 1 and 2 is caused to move by rolling the roller 6d along the inner surface of the work W at a predetermined roll axial direction position (Q point shown in FIG. 4). Position the axial position. Therefore, as described with reference to FIG. 4, there is no speed difference between the passing speed of the work W and the peripheral speed of the upper and lower rolls 1 and 2 in the width direction of the work W.

  On the entrance side and exit side on the large diameter side of the upper and lower rolls 1, 2, pressing means 7 for pressing the convex arcuate outer width end of the workpiece W is provided. The pressing means 7 meshes with a pinion 7b provided on the output shaft of the hydraulic motor 7a, and has a vertical roller 7d attached to the tip of a rack 7c parallel to the axis of the upper roll 1, and the positioning means 6 The roller 7d is brought into rolling contact with the outer width end of the work W at a position facing the roller 6d in the roll axis direction. The piping that supplies oil from the pressure source to the hydraulic motor 7a is provided with a relief valve that releases oil when a predetermined pressure is reached, and presses the workpiece W with a constant force. Therefore, escape of the workpiece W from the positioning means 6 can be prevented, and the workpiece W in each pass can be bent into a desired conical surface. The roller 7d may press the outer width end at a position facing the roller 6d of the positioning means 6 in the width direction of the workpiece W.

  As shown in FIG. 3A, each of the rollers 6d of the positioning means 6 on the inlet side and the outlet side is attached with the upper side inclined inward toward the upper roll 1 side. The reason for this is that the inner width end of the workpiece W is curved upward so as to protrude toward the small diameter side of the upper roll 1 in the horizontal plane when the number of passes increases and the bending curve becomes large. This is to prevent the inner width end that is curved from coming into contact with each roller 6d at an excessive portion on the roll small diameter side from the predetermined positioning position. Further, by inclining inward as described above, the inner width end of the workpiece W can be brought into contact with each roller 6d at an angle close to a right angle, so that each roller 6d can be smoothly contacted.

  As shown in FIG. 3B, the rollers 7d of the pressing means 7 on the inlet side and the outlet side are also attached with the upper side inclined inward to the upper roll 1 side. This is because the outer width end of the workpiece W is brought into contact with each roller 7d at an angle close to a right angle so that each roller 7d is smoothly rolled. Note that the outer width end of the work W is bent upward so as to escape from the large diameter side of the upper roll 1 in a horizontal plane when the bending curve increases, so there is no fear of hitting each roller 7d at an extra portion. .

  In the embodiment described above, the concave arcuate inner width end of the workpiece is positioned by the positioning means, and the convex arcuate outer width end is pressed by the pressing means. Conversely, the outer width end is pressed by the positioning means. It is also possible to position and press the inner width end with the pressing means. Moreover, the actuator of the pressing means is not limited to the hydraulic motor of the embodiment, and may be another actuator such as a hydraulic cylinder.

  In the embodiment described above, the positioning means and the pressing means are both configured such that the roller is brought into contact with the width end of the workpiece, but a simple bar-like or cylindrical member may be brought into contact with the width end of the workpiece. .

  In the above-described embodiment, a three-roll type bending roll apparatus in which two lower rolls are arranged obliquely downward on both sides of the upper roll is used. However, the bending roll apparatus according to the present invention has another one immediately below the upper roll. It is also possible to use a four-roll type in which lower rolls are arranged. Further, the product to be bent by the bending roll apparatus is a conical cylinder, but the product to be bent may be a partial conical cylinder such as a semi-conical cylinder.

DESCRIPTION OF SYMBOLS 1 Upper roll 2 Lower roll 3a, 3b Bearing box 4a, 4b Cylinder 6 Positioning means 6a Servo motor 6b Screw shaft 6c Nut 6d Roller 7 Pressing means 7a Hydraulic motor 7b Pinion 7c Rack 7d Roller

Claims (2)

The plate-like workpiece is provided with positioning means for passing the fan-like plate-like workpiece between tapered upper and lower rolls and positioning one width end of the plate-like workpiece to be passed between the rolls at a predetermined roll axial position. In the bending roll apparatus, the positioning means is provided on both the inlet side and the outlet side of the upper and lower rolls so as to face the positioning means, and the other width end of the plate-like workpiece is bent. And a pressing means for pressing the plate-like workpiece toward the positioning means with a constant force by a hydraulic actuator .   Positioning means for positioning one width end of the plate-like work is the predetermined roll that does not cause a speed difference between the passage speed of the plate-like work and the peripheral speed of the upper and lower rolls in the width direction of the plate-like work. The bending roll apparatus according to claim 1, wherein the bending roll apparatus is movable to an axial position.

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